Bug with Shyvana's Dragon's Descent, Tristana's Rocket Jump and Kha'Zix's Leap:

Had a Rioter state it's not meant to work like this and when I was reading release notes on Yasuo they talked about how frustrating it was when playing with this mechanic and said they removed it for that very reason but Yasuo is able to last Breath you on "Self-Airborne".

Think it might be a coding error seeing as a Rioter confirmed it's not meant to be like this and seems to have popped up recently seeing as it never used to work like this (as Rioters stated) and I've read the patch notes and there's nothing stating it:

Have confirmed in game that this happens and Rioter Jickoy mentioned he'd send in a report but also mentioned it'd be worth posting here.